What is the amount of calories needed toe heat 200 grams of water at 50 degrees

How many molecules of sucrose c12h22o11 are there in 454 grams of sucrose

What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees celsius to a solid at the same temperature? melting point of substance y = 35 degrees c; δhvaporization = 3.67 j/mol; δhfusion = 3.30 j/mol. mwsubstance y = 28.22 g/mol. −12.4 j −3.51 x 102 j 1.24 x 101 j 351 j

Why is the bottom layer of a trophic pyrimid the